Online Ozone Analyzer for Water – OzoSense
The OzoSense sensor is a membraned device which is insensitive to changing pH, uses no reagents, is extremely stable, and has reduced maintenance and reduced whole life costs.
The online dissolved ozone monitor sensors connect to a range of electronic instrument controllers from Pi resulting in world class online dissolved ozone monitoring and controlling solutions.
For more information on Pi’s dissolved ozone controllers, click here.
| Document | Type | Size |
|---|---|---|
| OzoSense | Brochure | 684kB |
| Residual Ozone Monitoring and Control | Article | 531kB |
| Using Open Flow Cells with Membraned Sensors | Technical Note | 762kB |
| DPD Checklist | Technical Note | 487kB |
| Probe Fouling | Technical Note | 459kB |
Ozone Monitor FAQs
What sensor ranges are available for ozone?
OzoSense is available in 0.05-0.2, 0.05-0.5, 0.05-2, 0.05-5, 0.05-10 and 0-20 mg/l (ppm) ranges.
Is it possible to measure ozone in seawater?
Ozonating seawater is quite different from fresh water, as the ozone reacts with bromine salts in seawater to produce bromine. We can supply a total bromine sensor for this application; please contact a member of the team if you are interested in this.
How often does my ozone sensor need calibrating?
Our ozone sensors have a very low rate of drift, so the frequency of calibration depends upon the needs of your application. Different customers are known to calibrate weekly or monthly.
How often does the ozone electrolyte need changing?
Changing the electrolyte every 3-6 months is recommended.
Is it possible to measure ozone if there are tensides (detergents) present?
Yes, you can; our ozone sensors have been designed to be resistant to the effects on tensides.
I want to return the sample to process. Can I operate the OzoSense at an overpressure to do this?
A closed flow cell can be supplied with OzoSense, and the sensor can withstand overpressure of 1 bar; this pressure must be constant to ensure reliable operation of the sensor. However, in most cases 1 bar is insufficient to return a sample to a process stream, so the majority of our customers use our open flow cells.
If the pH changes, will it affect my ozone reading?
Our membrane sensors are designed to be pH resistant, and so changes within the pH range of the sensor will have a negligible effect.
How long can the membranes and electrolyte be stored?
Both the membrane and the electrolyte can be stored for two years in a cool, dry place.
Are there any interferences?
There are know interferences with chlorine dioxide (<7%) and residual chlorine (<2%). If you have any concerns, please get in touch with a member of our team and we will be happy to discuss this with you.
What are the MoCs?
The sensor is constructed from PVC and stainless steel, while our open flow cells are manufactured out of perspex.
What temperature range will the ozone sensor work in?
The OzoSense will operate at temperatures above 3°C (38°F) and below 50°C (122°F).
Why does the ozone sensor have no zero adjustment?
A zero adjustment is not necessary because the sensor always operates at a positive voltage. Because of this any drift on the zero is negligible compared to the operating voltage.
If the temperature varies, what will happen?
Our sensors have an internal thermistor that allows for automatic temperature compensation, so there is no need to worry about temperature variation.
What is the best way to calibrate my ozone sensor?
Many of our customers use handheld meters to determine the chlorine concentration for calibration, generally using colorimetric DPD analysis. These are available from a wide variety of suppliers.
I am going to take a sample to do a test. What do I need to be aware of?
Three things; timing, location and execution. Take your sample when the concentration is varying as little as possible, take it from the same location as the sensor and follow the instructions for your handheld device carefully.
During the calibration process, the analyzer has warned me that the sample isn't stable. Why?
The analyzer monitors the stability of the probe signal during the calibration process. If this varies by more than 10% during the calibration countdown, then the analyzer will not accept the result. This is to prevent the calibration routine from introducing inaccuracies into the sensor reading.
What is Ozone?
Ozone is an inorganic chemical with the formula O3. In time it breaks down to O2.
Why would ozone be used to disinfect water?
Ozone is a useful disinfectant for a number of reasons. Firstly, it is a very powerful oxidant which makes it highly effective for destroying pathogens, even those known to be resistant to chlorine (such as Giardia and Cryptosporidia). Secondly, it has the ability to react with and remove manganese from water, which is very useful in specific cases.
Why is ozone considered to be a better choice for some applications?
Because it is made up solely of oxygen atoms, disinfecting with ozone leaves no taste or odor. This, and its ability to break down urea, means that ozone disinfection does not leave behind by-products such as organochlorines or combined chlorine compounds that some users wish to avoid.
Is an ozone monitor the same as an ozone analyzer or an ozone controller?
The terms ‘monitor’ and ‘analyzer’ are basically interchangeable and refer to an instrument that can measure/display certain parameters. A ‘controller’, as the name suggests, refers to an instrument that also has onboard control functionality. All Pi systems can have this functionality, and so an OzoSense can be considered a monitor/analyzer and also a controller.
"The Pi products provide excellent value for money and represent the best municipal drinking water analyzers available."
John Clark
Chemtrac - Atlanta
"The support from Pi and its partners is superb. They go above and beyond to ensure that, not only is their equipment perfect but that the process is working great too. Five Stars!"
Anthony Glitto
Equip Solutions - Illinois, USA
"Going from ORP control to amperometric chlorine sensor control has undoubtedly improved the pool water immensely!"
Chris Tedeschi
Link Automation - USA
"We've been using these analyzers since 2008. They're easy to use and very stable. Calibration and maintenance is quick and simple."
Lloyd Gruginski
Chehalis WTP - Chehalis, WA
"We at Scottish Water have been using the excellent Pi LabSense 3 and portable UV254 instruments in the field for optimizing our Water Treatment processes for some years now. We find them easy to use and invaluable for detecting and resolving issues in a timely, efficient and effective manner. Two great pieces of kit!”
Paul Weir
Scottish Water - UK
"I want to thank you and all at Process Instruments for all the assistance, information and handholding during the year. The help that was so freely given was very much appreciated. Can you please extend my appreciation to all at Pi and let me wish you all a happy, safe and wonderful Christmas and I look forward to working with you again in 2021."
Michael Bailey
Wexford Co. Co. - Ireland
"Excellent level of support and always so much more prompt than a lot of our suppliers."
Phill Tuxford
Detectronic - UK
"The plant can’t produce good quality water without the CoagSense."
Mick Murphy
Wexford Co. Co. - Ireland
"We started using Process Instruments 10 years ago and they worked so well that when we were looking at expanding, Process Instruments were our "go to" company."
Rebecca - Pool Manager
Woodland Spa - Burnley, UK
"We've been installing pools and spa controllers from Pi for more than 10 years and they just are the best on the market."
Dr. Lester Symmonds
Pool Sentry - UK
"We've used the CRIUS® with chlorine, pH and conductivity sensors for several years and confirm quality, performance and reliability has been wholly satisfactory to date."
David Kerr
Karis Technical Services Ltd. - UK
"We in ECM ECO Monitoring can only recommend Process Instruments products and services to all other potential clients. They have very complex portfolio of products for water quality monitoring in various types of industries, friendly attitude, very quick delivery time and prompt reaction to all our needs and inquires. Our clients especially appreciate the particle counters and sizers allowing identification of drinking water treatment problems. The Streaming Current Monitors are a great tool for optimisation of expensive chemicals.”
Branislav
ECM ECO Monitoring - Slovakia
"Simply the best turbidity available."
John Clark
Chemtrac - Atlanta, GA
"In 2019, we purchased 29 particle counters which were installed in our water plants. So far, their performance has been perfect."
Li Yongjun
Jinan Hongquan Water Company - China
"We have installed hundreds of ozone analyzers from Pi over the years. They are just accurate, reliable and require low maintenance."
Jiao Tumei
Qingdao Guolin Environmental Technology Co., Ltd., - China
"Over the last few years we've purchased chlorine and turbidity analyzers from Chemtrac and with routine calibration the probes measure the chlorine and turbidity without any issue. We are very happy with this product and would highly recommend them."
Daniel "Buck" Owen
Ocoee Utility District - Ocoee TN
“Servicing customers is much more than just solving problems or addressing complaints and Pi does that very competently with technical and quick efforts providing a good experience."
Clovis Tuchapski
Buckman - Latin America
"Pi's technical team has enabled us to be one step ahead of our competitors by adding value to our projects thanks to their fast and excellent support from the moment you first reach out.
Ibrahim Kaplin
Thermomed - Turkey
"The Streaming Current Monitor from Pi is the best SCM I have ever used. The analyser responds quickly and has many powerful functions, which helps me save a lot of money."
Ye Yancong
Xiamen Xishan Water Plant - China
“Process Instruments has a broad range of high quality and user-friendly solutions for water-industry problems. The short lead times and great customer support make Pi a reliable partner.”
Péter Szabó
SC KATALIN NOHSE CHIMIST IMPORT SRL - Romania
"Process Instruments UK always have a high level of customer service. All our interactions with Pi have exceeded our expectations. It is always a pleasure working with you.”
Iñaki Seisdedos Rodríguez
Izasa Scientific - Spain
"Process Instruments UK always have a high level of customer service. All our interactions with Pi have exceeded our expectations. It is always a pleasure working with you.”
Rudi Tuffek
Allpronix - South Africa
